Dressing attachment for grinding wheels



April 6 ,1926. 1,579,691

H. E. DURKEE DRESSING ATTACHMENT FOR GRINDING WHEELS Filed Feb. 20, 1922 Patented Apr. 6,1926.

.ulursnsrai'iss y1,579,691 PATENT-oFi-ica HENRY E'D'UBKEE, 0F GLASTONBRY, CONNECTICUT, A'SSIG'NR TO PRATT WHITNEY COMPANY, F NEW YORK, N. Yi, CORPORATION 0F NEW JERSEY.

DRESSING ATTACHMENT Fon GRINDING WHEELS. f

i Application led February 20, 1922.. Serial No. 538,018. v

To all whoml t may concern:

Be it known that I, HENRY E. DURKEE, a citizen of the United States, residing at Glastonbury, in the county of Hartford and State-of Connecticut, have invented certain new and useful Improvements in Dressing Attachments for Grinding Wheels, of which the following is a specification.

This invention relates to an improvedform of dressing attachment for grinding wheels and in particular to an attachmentadapted to permit theaccurate dressing or truing of a. plurality of work engaging surl faces on a grinding wheel.

An object of the present invention is to provide a dressing attachment for grinding wheels especially adapted to dress or truei Another-object of the invention is to form the attachment in such a way that it will be readily adapted 'for adjustment for different types of threads and vfor the varying size of the wheel. Also that the dressing tool thereon may be easily operated manually and the device'may, when not in use, be pivotally swung about' the grinding head so that it.

will be out of the way.

Another object of the invention is to pro- 'vide guides or guiding members soarranged 40 be accurately ositioned while being passed across each o? the work engaging surfaces of the wheel. A still further object of the invention that is of importance yis that the guiding means for the .dressing tool comprises pins outstandingy from a flat surface on the attachment and arranged in pairs so thatv the dressing tool may be positioned against different pairs of pins for each surface of. the wheel to be dressed.

Another feature'v which is advantageous."

is that adjustments are permitted between different pairs of guiding members so that on the attachment that the dressing toolmay the relative positions of the dressed surfaces 5c of the wheel may be varied. As the attachment ls'pi'imarily adapted for screw thread grinding machines, one `pair of guiding members is mounted directly on the grinding attachment and' two other. pairs of 60 guiding members are mounted on a plate, the position of which relative to the main portion of thev attachment may be slightly varied. ,By vthis means the dressing* tool 1 may be so held that it will dress the work engaging surfaces of the wheel in such a vmanner that the central portion of the wheel may have its width materially varied. By suitable adjustments of the plate relative to the body member of the attachment this central portion may be varied in width in accordance with the dierent forms and sizes of screw threads being ground.

With these and other objects in view,'my invention consists in the features of con 75 struction and operation-set forthin the following specificationand illustrated in. the accompanying drawing. I

In the `accompanying drawing annexed v hereto and forming a part of this specica- 3 tion, I have shown my invention ,embodied in a -screw .thread grinding machine but it will be understood that the invention vcan be otherwise embodied and that the drawing is not to` be construed as deining or limiting the sc ope of the invention, the claims appended tothe specification being relied upon for that purpose. In the drawing.: Figure 1 is a side elevation of Va wheel 004 head provided with a dressing attachmentv made 1n accordance with'the present invention. v A

Fig. 2 is a View of the dressing attachment looking in the direction of the arrow marked No. 2, shown inl Fig. 1.-

Fig. 3 is a front view of the dressin attachment looking in the direction o the arrow marked No. 3 in Fig. 1.

Fig. 4 is a transverse sectional view taken 100 on line 4-41of Fig. 3.

Fi 5l is adetached view of a form of dressing tool used in connection with this attachment.

Fig. 6 is an end view of the saine.

In the above mentioned drawing, I have shown but one modification of the invention which is now deemed preferable but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, my invention in its broadest aspect comprises the following principal parts: namely, a frame adapted to be pivotally mounted upon the wheel headof a grinding machine; second, a body member adjustably positioned thereupon; third, a plate movably mounted on said body member; fourth, positioning devices preferably in the form of pins on said plate adapted to retain a dressing tool in position while it is being passedk across the angularly disposed surfaces of the wheel; fifth, guiding means on the body member to'position the dressing tool while ope-rating upon a third surface of the wheel; sixth, means to adjust the plate relative to the body member; and seventh, means to secure the attachment in operative position.

Referring more in detail to the figures of the drawing, I provide a wheel head 10 having an abrasive wheel 11 mounted upon a shaft 12 and rotating in suitable bearings provided within the wheel head 10. Preferably, the wheel 11 is provided with a protective enclosure 13 forming a part of the wheel head 10. This protective covering 13 is provided with oppositely disposed projections or pads 15 on both sides forming the pivotal support for the frame 16 comprising the dressing attachment. These projections or pads 15 are provided with pins 17 which are engaged by arms or extensions of the attachment member 16. From this construction, as shown in Figs. l'and 3, it will be seen that the dressing attachment 1.6 as a whole may be swung about an axis 'represented by the pins 17 on the wheel housing 13 and may thus be readily moved from operative to inoperative position. When it is not desired to use the attachment 16, it is only necessary toelevate theforward portions thereof so that it may be swung about the pins 17 and rest upon the rear surfaces of the wheel head 10. When the attachment is in operative position, a projection 18 provided on the attachment is in engagement with a stud 19 provided in the wheel head 10. A knurled nut 20 threaded to this stud 19 holds the attachment 16 firmly in operative position. For convenience, the pins 17 are provided with knurled nuts 17a so that the member 16 may be securely clamped in operative position on the pins 17.

The attachment 16 may be made up of separate members rigidly held together by means of screws 16a.

On the forward portion of the attachment 16 a`slide-way 25 is provided in which a body member 26 slides. To adjust the position of this body member 26 along the slide, a screw 27 is provided having a nut 28 securedin any preferred way to the attachment. The screw 27 is adapted to be ro 4tated by means of a knurled handle 29.

Mounted on the upper surface of this body member 26 on opposite sides are two pins forming guides for a truingor dressing tool. One of these pins 31 is fastened directly to the upper surface of the member 26. The pin on the opposite side shown at 32 is positioned in a bracket member 33 secured to the upper surface of the body member 26. These pins 31 and 32 are-of identical diameters and are so positioned that their surfaces facing the abrasive wheel 11 are parallel to the axis of this wheel. Y The function of these pins on body member 26 will presently be described.

The body member 26 is provided with a central depression in which a slide 35 may be adjustablypositioned. Clamping screws 36 shown in Fig. 2 are provided permitting clamping of this plate 35 to the body member 26. The screws 36pass through elongated slots 37 in the slide 35, thus permitting the slide 35 to be clamped in any desired adjusted position. To vary the adjustment of this slide 35 relative to the body member 26 a0 screw 42 is provided extending through a projection mounted on the body member v 26 and engaging one of the end surfaces of the plate 35. l A. i,

j On the upper surface of this plate 35 pins 38, 39, and 40, 41 are provided. These are so disposed relative to each other that when a dressing tool, to be presently described, is positioned against one or the other of thesepairs of pins, it may be moved obliquely toward and from the wheel in a direction having a predetermined angular relationship to the axis of the wheel. f desired several plates such as that shown at 35 may be provided having guide pins positioned so that diderent angularly disposed surfaces may be formed on the wheel.

A suitable dressing or truing tool adapted for use in connection with this attachment is method of operation of this device, the attachment is swung into its forward position as shown 1n Fig. 1 and secured 1n that position by means of the knurled nut 20. The

body member 26 is then adjusted in position relative to the periphery of the wheel so that the dressing tool 50 may be positioned in contact with the pins 3l and 32 and passed across the outer periphery of the wheel. The position of the truing tooll while engaged in dressing this surface of .the'wlieel is shown in Fig. 2 in dotted lines. The

dressing tool 50 may then be placed first in contact with one of the pairs of pins 38, 39 or 40, 41, land then in contact with the other pair.' These pins are, as above described, fastened to and outstanding from the plate 35. With the truing tool in' contactv first with one of these 'pairs of pins and then in contact with the opposite pair, the truing tool is passed Yacross the angularly disposed surfaces of the wheel.

It is obvious that with ,the pla-te in one adjusted position relative to the. body inem-v ber 26,-the surfaces on the wheel dressed'by the attachment will form surfaces which are angular-ly opposed relative to each other in accordance with the positions of the pins 31, 32, 38, 39 and 40, 41; f The pairs of pins 38, 39 and 40, 41 must be so positioned that they will give the required angular form to the lateral surfaces of fthe wheel and these two surfaces of the wheel must bepositioned relative to the central peripheral surface of the wheel so that the correct width of the cylindrical portion will be formed. To vary A ythe attachment so that it :may be used to the width of thiscentral cylindrical portion `of the wheel, it is necessary to vary the relative positions of the plate 35 and Athe body member 26. This is accomplished by means of screw 42.

It will be seen from the above description,

that a truing attachment has been provided which may be readily moved into` and out of operative position and which may be used to dress a plurality of angularly disposed surfaces on a wheel. Also, that by means of a simple'adjustment of a single screw 27,

.the attachment 16 may be so adjusted that it may be used for different sizes of wheels and may be adjusted to compensate for the wearing away of the wheel. Also that an.

independent adjustment by means of screw l2 has been provided which will permit relatively different positions between the cylindrical 'and conical surfaces dressed by dress Wheels for various sizes of screw threads having different widths of cylindrical surface at the bottom ofthe thread. Also, by substituting other plates 35having the pins thereon differently arranged the wheel may be dressed with its side surfaces at anydesired angles.

What I claim is:

l. A truing attachment for screw thread v grinding machines comprising in combination,.a. bodymember adapted to be pivotally mounted whereby it may be swung into and out of operative position adjacent a grind ing wheel, and guiding means for a ydressing toolv thereon whereby a dressing -tool may be guided to true a plurality of surfaces of said. wheel, said guiding means comprising obliquely disposed pairs of pins outstanding from said body member.

2. A truing attachment for screw thread grinding machines comprising in combination, a body member adapted to be pivotally mounted whereby it may be swung into and v out of operative position adjacent a grinding wheel, and guiding means for a dressing tool thereon whereby a dressing tool may be guided to vtrue a plurality of angularly disposed surfaces of said wheel, said guiding means comprising pins arranged in pairs outstanding from said'body member.

3. A truing attachment for screw thread grinding machines comprising in combination, a body member adapted to be pivotally mounted whereby it may be swung into and .out of operative position adjacent -a grinding wheel, and guiding means for a dressing tbol thereon arranged in pairs whereby a dressing tool may be guided to true a plurality of surfaces of said wheel, said guiding means comprising pins outstanding from 'said body member, two of said pins being used to guide said dressing tool in each operative position.

4. A truing attachment for grinding wheels comprising in combination, a body member. a plate thereon, guiding means on said body member and plate for a dressingV tool, a bar forming said dressing tool having I a vtruing tool mounted therein adapted to be passed across a plurality of .faces of said wheel while supported` in position 'against i said guiding means, and means to adjust the position of said plate relative to said body member whereby the relative positions of surfaces dressed by said tool may be varied.

5. A truing attachment for grinding wheels comprising in combination, a' body member, a plate thereon, guiding means on said body member and plate for a dressing tool, abar forming sai-d dressing tool having a truing tool mounted therein adapted to be passed across a plurality of faces of said wheel while supported in position against' mounted-therein adapted to be passed across a plurality of faces of said wheel while supported in position against -said guiding means, and means to adjust the position of Vsaid plate relative to said body7 member whereby the relative positions of surfaces dressed by said tool may be varied.

7. A truing attachment for Screw thread .grinding machines comprising iny combination, a body member Iada ted to bev positioned adjacent a grinding VW eel, guiding means for a dressing tool on said body member a plate on said body member carry'-l ling pairs of guiding pins for dressin adapted to be passed across ,oppositey disposed surfaces of said wheel, means to adjust the position of said plate relative to' said body member,A and a vdressin tool adapted to be positioned adjacent di erent pairs of guiding means.

8. Avtruingv. attaclunent f or screwv thread grinding machines comprislng 1n combination, a body member adapted to be positioned-adjacent a grinding Wheel, a dressing tool therefor, guiding means for said dressing tool adapted to position it Whilev being passed across the outer periphery of said Wheel in a direction parallel to the axis of the wheel, a plate on said body member also carrying guiding means for. said dressing tool and adapted to guide 1t While being lpassed across angularly disposed sides of toolssaid wheel, and means ,to adjust the position ofsaid plate relativto sai-d body member in a straight line whereby the relative positions of the,surfaces dressed may be varied. 9. A truingl attachment for srew thread grinding machinesco'mprising incombination,v a body member adapted to be positioned adjacent a grinding wheei, guiding means on said body member for said dress ing tool adapted to guide said tool while being passed across the outer periphery of said Wheel, a plate on said body member also carrying guiding means for said dressing tool, means to adjust the position of said plate'relative to said body memberin a direotion toward or from the axis of rotation HENRY E. DURKEE. 

